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Simplify rpitit handling on lower_fn_decl #102013

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Merged
merged 1 commit into from
Sep 20, 2022
Merged

Simplify rpitit handling on lower_fn_decl #102013

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60 changes: 15 additions & 45 deletions compiler/rustc_ast_lowering/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -324,16 +324,10 @@ enum FnDeclKind {
}

impl FnDeclKind {
fn impl_trait_return_allowed(&self, tcx: TyCtxt<'_>) -> bool {
fn impl_trait_allowed(&self, tcx: TyCtxt<'_>) -> bool {
match self {
FnDeclKind::Fn | FnDeclKind::Inherent => true,
FnDeclKind::Impl if tcx.features().return_position_impl_trait_in_trait => true,
_ => false,
}
}

fn impl_trait_in_trait_allowed(&self, tcx: TyCtxt<'_>) -> bool {
match self {
FnDeclKind::Trait if tcx.features().return_position_impl_trait_in_trait => true,
_ => false,
}
Expand Down Expand Up @@ -1698,9 +1692,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
}));

let output = if let Some((ret_id, span)) = make_ret_async {
match kind {
FnDeclKind::Trait => {
if !kind.impl_trait_in_trait_allowed(self.tcx) {
if !kind.impl_trait_allowed(self.tcx) {
match kind {
FnDeclKind::Trait | FnDeclKind::Impl => {
self.tcx
.sess
.create_feature_err(
Expand All @@ -1709,51 +1703,27 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
)
.emit();
}
self.lower_async_fn_ret_ty(
&decl.output,
fn_node_id.expect("`make_ret_async` but no `fn_def_id`"),
ret_id,
true,
)
}
_ => {
if !kind.impl_trait_return_allowed(self.tcx) {
if kind == FnDeclKind::Impl {
self.tcx
.sess
.create_feature_err(
TraitFnAsync { fn_span, span },
sym::return_position_impl_trait_in_trait,
)
.emit();
} else {
self.tcx.sess.emit_err(TraitFnAsync { fn_span, span });
}
_ => {
self.tcx.sess.emit_err(TraitFnAsync { fn_span, span });
}
self.lower_async_fn_ret_ty(
&decl.output,
fn_node_id.expect("`make_ret_async` but no `fn_def_id`"),
ret_id,
false,
)
}
}

self.lower_async_fn_ret_ty(
&decl.output,
fn_node_id.expect("`make_ret_async` but no `fn_def_id`"),
ret_id,
matches!(kind, FnDeclKind::Trait),
)
} else {
match decl.output {
FnRetTy::Ty(ref ty) => {
let mut context = match fn_node_id {
Some(fn_node_id) if kind.impl_trait_return_allowed(self.tcx) => {
let fn_def_id = self.local_def_id(fn_node_id);
ImplTraitContext::ReturnPositionOpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),
in_trait: false,
}
}
Some(fn_node_id) if kind.impl_trait_in_trait_allowed(self.tcx) => {
Some(fn_node_id) if kind.impl_trait_allowed(self.tcx) => {
let fn_def_id = self.local_def_id(fn_node_id);
ImplTraitContext::ReturnPositionOpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),
in_trait: true,
in_trait: matches!(kind, FnDeclKind::Trait),
}
}
_ => ImplTraitContext::Disallowed(match kind {
Expand Down